Austenitic stainless steel continuous pipe and manufacturing method thereof

A technology of austenitic stainless steel and manufacturing method, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problem that the corrosion resistance can not meet the requirements of use, and achieve good mechanical properties, improved corrosion resistance, Good corrosion resistance

Active Publication Date: 2014-08-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, coiled tubing products are mainly made of carbon steel and low-alloy high-strength steel, which can generally meet the requirements of most oilfield operations. However, as my country’s oil and gas exploration and development b...

Method used

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Examples

Experimental program
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Embodiment Construction

[0039] What this embodiment manufactures is 16Cr austenitic stainless steel continuous pipe, and its main manufacturing steps are as follows:

[0040] 1. Preparation of 16Cr austenitic stainless steel coil

[0041] The molten iron is used as the main raw material, and is refined in a top-bottom compound blown converter, argon-oxygen decarburization (AOD) and a ladle refining furnace. The composition mass percentage of the molten steel meets the following requirements before being tapped and cast into continuous casting slabs.

[0042] C: 0.025% max; Mn: 8.5%; Cr: 16.2%; Ni: 2.5%; N: 0.25%; P: 0.02%;

[0043] Using continuous casting technology and applying electromagnetic stirring control to cast a slab with a thickness of 20-60mm, reheat it to about 1100°C, and use a hot strip mill to roll it into a hot strip with a thickness of 3.18mm and a width of 1120mm through a thermomechanical control process (TMPC). The plate is rolled, and then properly controlled and cooled to form...

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PUM

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Abstract

The invention discloses an austenitic stainless steel continuous pipe and a manufacturing method of the austenitic stainless steel continuous pipe. The austenitic stainless steel continuous pipe comprises, by mass percent, 0.03% or below of C, 5-10% of Mn, 13-19% of Cr, 1.5-3.0% of Ni, 0.15-0.5% of N, 0.04% or below of P, 0.01% or below of S, and the balance Fe and unavoidable impurities. A plate for the continuous pipe is manufactured through the processes of refining, controlled rolling, acid pickling and the like; pipe manufacturing is conducted by the adoption of cage-roll forming and the high frequency induction welding (HFW) technology; the austenitic stainless steel continuous pipe is manufactured through follow-up heat treatment. The austenitic stainless steel continuous pipe is good in mechanical performance and corrosion resistance, applicable to environments where the austenitic stainless steel continuous pipe makes direct contact with CO2, and capable of being used under gas wells with high CO2 content in Sichuan province, Tarim and the like, and the corrosion resistance of the austenitic stainless steel continuous pipe is improved by over 3 times compared with a common low-carbon micro-alloyed steel continuous pipe.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas pipes, in particular to an austenitic stainless steel continuous pipe and a manufacturing method thereof. Background technique: [0002] Coiled tubing has been widely used in oil field workover, drilling, completion, logging, stimulation and other fields in the oil and gas industry. Coiled tubing will play an increasingly important role in oil and gas field exploration, development, operation, and production stimulation because coiled tubing technology has a series of technical and operational advantages such as high efficiency, low cost, wide operating range, and small footprint. ,with broadly application foreground. [0003] At present, coiled tubing products are mainly made of carbon steel and low-alloy high-strength steel, which can generally meet the requirements of most oilfield operations. However, as my country’s oil and gas exploration and development become more difficult, some 2 ...

Claims

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Application Information

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IPC IPC(8): F16L9/02B23P15/00
CPCB21C37/0807F16L9/02
Inventor 毕宗岳李鸿斌余晗张晓峰鲜林云汪海涛赵俊张国超晁利宁
Owner BC P INC CHINA NAT PETROLEUM CORP
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